Abstract: An Intelligent Synchronization Module (ISM) for an Uninterruptible Power Supply (UPS) system for servicing a load is disclosed. The UPS system has at least one of a first UPS group and a second separate and independent UPS group, each of the first and second UPS groups having a master UPS. The ISM has a processing circuit and a storage medium, readable by the processing circuit, storing instructions for execution by the processing circuit for: assigning the first UPS group the role of master group and the second UPS group the role of slave group; and, passing phase information relating to the master group to the slave group, thereby enabling the master UPS of the slave group to effect synchronization with the master group.

Abstract: A method and apparatus for modulating a discontinuous conduction mode (DCM) Boost Rectifier having a switchable booster section is disclosed. A modulation signal is defined according to the equation, TON(?)=f1(?)+f2(?)+f3(?). Here, ? defines a phase angle for an input phase voltage of the DCM Boost Rectifier; TON(?) defines a modulation characteristic for an ON time of the booster section, and is a continuous function; f1(?) defines a first function from 0????/3; f2(?) defines a second function from ?/3???2?/3; and, f3(?) defines a third function from 2?/3????. The switchable booster section is then modulated using the modulation signal.

Abstract: An Intelligent Synchronization Module (ISM) for an Uninterruptible Power Supply (UPS) system for servicing a load is disclosed. The UPS system has at least one of a first UPS group and a second separate and independent UPS group, each of the first and second UPS groups having a master UPS. The ISM has a processing circuit and a storage medium, readable by the processing circuit, storing instructions for execution by the processing circuit for: assigning the first UPS group the role of master group and the second UPS group the role of slave group; and, passing phase information relating to the master group to the slave group, thereby enabling the master UPS of the slave group to effect synchronization with the master group.

Abstract: A method and apparatus for modulating a discontinuous conduction mode (DCM) Boost Rectifier having a switchable booster section is disclosed. A modulation signal is defined according to the equation, TON(?)=f1(?)+f2(?)+f3(?). Here, ? defines a phase angle for an input phase voltage of the DCM Boost Rectifier; TON(?) defines a modulation characteristic for an ON time of the booster section, and is a continuous function; f1(?) defines a first function from 0????/3; f2(?) defines a second function from ?/3???2?/3; and, f3(?) defines a third function from 2?/3????. The switchable booster section is then modulated using the modulation signal.